package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCDemo3 {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection conn = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "ROOT"
        );
        Statement statement = conn.createStatement();
        String sql = "UPDATE userinfo" +
                "SET password='666666' " +
                "WHERE username=''";
        int num=statement.executeUpdate(sql);
        if(num>0){
            System.out.println("修改成功");
        }else {
            System.out.println("修改失败");
        }
        conn.close();
    }
}
